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Retirement and Pension Plans - Components of Net Periodic Pension Benefit Expense (Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Defined benefit plans: |  |  |  |
Service cost | $ 596 | $ 727 | $ 1,168 | $ 1,457
Interest cost | 7,325 | 6,978 | 14,500 | 13,967
Expected return on plan assets | (13,236) | (13,619) | (26,330) | (27,251)
Amortization of net actuarial loss and other | 2,066 | 2,333 | 4,085 | 4,670
Pension income | (3,249) | (3,581) | (6,577) | (7,157)
Other plans: |  |  |  |
Defined contribution plans | 11,187 | 10,985 | 23,691 | 25,580
Foreign plans and other | 1,184 | 2,287 | 2,988 | 3,976
Total other plans | 12,371 | 13,272 | 26,679 | 29,556
Total net pension expense | $ 9,122 | $ 9,691 | $ 20,102 | $ 22,399

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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